import threading
import time

exitFlag = 0
def print_time(threadName, delay, counter):
    while(counter):
        if exitFlag:
            threadName.exit()
        time.sleep(delay)
        print("%s: %s" % (threadName, time.ctime(time.time())))
        counter -= 1

class myThread(threading.Thread):
    def __init__(self, threadID, name, counter):
        super(myThread, self).__init__()
        self.threadID = threadID
        self.name = name
        self.counter = counter

    def run(self):
        print('开始线程' + self.name)
        print_time(self.name, self.counter, 5)
        print('退出线程' + self.name)



thread1 = myThread(1, 'thread1', 1)
thread2 = myThread(2, 'thread2', 2)

thread1.start()
thread2.start()
print(threading.activeCount())
thread1.join()
thread2.join()
print('退出')
